Real-time Heralded Non-Gaussian Teleportation Resource-State Generator Enables Improved Fidelity Communications
Summarize this article with:
Quantum teleportation, a cornerstone of future communications networks, relies on sharing entangled states between distant parties, and researchers now demonstrate a significant step towards enhancing this technology. Joseph C. Chapman, Yanbao Zhang, Joseph M. Lukens, and colleagues at Oak Ridge National Laboratory and Purdue University have experimentally created a heralded resource state specifically designed for non-Gaussian teleportation, achieving real-time operation. This achievement addresses a key limitation in quantum communication, as theoretical studies suggest non-Gaussian entangled resources outperform traditional Gaussian states in terms of teleportation fidelity. By developing a sophisticated photon-subtraction system and synchronized detection server, the team successfully generates and characterizes this complex state, paving the way for advancements in quantum repeaters, non-Gaussian computing, and measurement-based quantum information processing.
Metropolitan Quantum Teleportation Experiment Demonstrated Scientists have successfully demonstrated a sophisticated experimental setup for quantum teleportation, addressing the practical challenges of maintaining stable, high-quality quantum links over metropolitan distances. The research focuses on achieving real-time operation and distributed control, moving beyond single-shot demonstrations towards continuously operating teleportation systems. The experiment utilizes a two-mode squeezed state as the foundational entangled resource, employing photon subtraction to engineer the desired quantum state and a crucial feedforward displacement to reconstruct the teleported state at the receiver. Maintaining system coherence and synchronization presented significant hurdles, which the team overcame through innovative techniques. A sophisticated phase stabilization scheme, incorporating a continuous wave seed signal and pulsed seed for photon subtraction, ensures quantum state stability. This scheme transmits phase error signals via radio frequency over fiber optics for remote control, and amplification and filtering of the radio frequency over fiber links compensate for signal loss. A shared clock synchronizes all system components, and precise timing is critical, achieved through a network of delays and synchronization signals. The experiment leverages field-programmable gate arrays for real-time signal processing, control, and data acquisition, and utilizes dual-homodyne detection to characterize the quantum state.
This research represents a significant step towards building practical quantum networks, demonstrating real-time operation, radio frequency over fiber integration, and sophisticated stabilization techniques. Real-time Heralded Entanglement Purification and Orchestration Scientists engineered a real-time system for generating heralded non-Gaussian entangled states, crucial for advancing quantum networking and computation. This work pioneered a method for purifying two-mode squeezed vacuum through photon subtraction, achieving significant improvement in entanglement quality before use in quantum protocols. Researchers developed a photon-subtraction orchestrator system, implementing live multi-mode, multi-detector coincidence analysis circuitry to generate low-latency, low-jitter heralding signals. Crucially, the orchestrator coordinates with a newly developed homodyne detection server, enabling real-time quadrature measurements of photon-subtracted wave packets. The server buffers and transmits samples requested by the orchestrator, corresponding to detected heralded resource states, allowing for distributed two-mode homodyne tomography and state verification.
The team implemented this system using fiber-coupled, frequency non-degenerate two-mode squeezed vacuum in the optical C-band, ensuring compatibility with deployed wavelength-division-multiplexed fiber networks and coexistence with classical signals. Real-time Heralded Teleportation Resource State Generation Scientists have demonstrated a real-time heralded resource-state generator for non-Gaussian quantum teleportation, achieving a significant advancement in quantum networking protocols. Researchers experimentally created a heralded two-mode resource state, verifying its quality through two-mode homodyne tomography and achieving a fidelity of 0. 973 with the expected state. This breakthrough relies on a novel photon-subtraction orchestrator system, which performs live coincidence detection and generates low-jitter, low-latency heralding signals.
The team developed a synchronized homodyne detection server, enabling the collection of real-time quadrature measurements of photon-subtracted states, coordinated by the orchestrator system. This coordination allows for distributed two-mode homodyne tomography, used to verify the quality of the heralded resource states. The generated states are compatible with existing fiber networks, operating within the optical C-band, and are designed for coexistence with classical signals. Real-time Entangled State Generation Demonstrated This research demonstrates a heralded resource state generator capable of real-time operation, representing a significant advancement for non-Gaussian teleportation and other quantum technologies. Scientists developed a system that creates and characterizes entangled states using photon subtraction from squeezed light, achieving a resource state with high fidelity to the intended target.
The team’s approach involved frequency non-degenerate two-mode cavity filtering, enabling negligible background counts and facilitating the generation of high-quality entangled states. Beyond teleportation, this type of resource holds promise for enhanced quantum sensing due to its increased squeezing and entanglement. Researchers suggest that leveraging two-mode generalized photon subtraction could dramatically increase the rate of non-Gaussian teleportation, and closer coordination between the photon-subtraction orchestrator and homodyne detection server could facilitate breeding of non-Gaussian states and feedforward for measurement-based quantum computing. 👉 More information 🗞 Real-time heralded non-Gaussian teleportation resource-state generator 🧠 ArXiv: https://arxiv.org/abs/2512.08429 Tags: